Online Web MIDI Piano and Synthesizer Diagnostic Lab
Connect any USB MIDI keyboard, digital piano, or synthesizer to test key velocity, pitch bend wheels, and sustain pedals online using the Web MIDI API.
Web MIDI Diagnostic Features
- Authentic 3D Grand Piano Visualizer: High-contrast 3-octave piano keyboard (C3 to C6) with 3D ivory white keys, matte black sharps, and red felt Steinway top trim.
- Key Hit Velocity Gauge (0 to 127): Measures key strike velocity to test sensitivity curves.
- Pitch Bend Wheel Tracking: Displays real-time pitch bend positions (-8192 to +8191).
- Sustain Pedal Indicator (CC #64): Visual ON and OFF state indicator for damper and sustain pedals.
- Raw MIDI Event Logger: Real-time console log of MIDI Note ON, Note OFF, velocity, and Control Change messages.
Compatible with all browsers supporting the Web MIDI API (Chrome, Edge, Opera) on Windows, macOS, Linux, and Android.
Supported MIDI Devices
| Device Type | Connection Type | Input Tested |
|---|---|---|
| MIDI Keyboards | USB MIDI / MIDI-to-USB Cable | 88 Keys, Velocity, MIDI Channels |
| Digital Pianos | USB Type-B / MIDI Output | Sustain Pedal (CC #64), Soft Pedal |
| Synthesizers & Controllers | USB MIDI | Pitch Bend, Modulation Wheel, Velocity |